For example,

Forecasts have emerged of heavy rain.

A structurally sound argument was presented of the characteristics and implications of economic recessions.

Is the prepositional phrase modifying "forecasts" or is it actually modifying the verb? I've heard sentences like this used before, but are they grammatically correct?

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    Yes, it's grammatically correct. I'd say that the PP "of heavy rain" is complement of "forecasts". It has probably been postposed to the end of the clause in order to receive a somewhat greater phonological prominence. – BillJ Feb 6 at 16:37
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    @johnnyodonnell That is what the phrase means if written without a comma. As you say they sound absurd. That is why they should have a comma. – mama Feb 6 at 16:46
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    Well, you are not sure if you are wrong, but you are. That is one of the main uses of a comma, separating an adjectival interrupting phrase. – mama Feb 6 at 17:02
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    No comma is required. This is a simple case of a PP being postposed to a position after the verb. It can't possibly be seen to be modifying the verb. The basic non-preposed order would be "Forecasts of heavy rain have emerged". – BillJ Feb 6 at 17:55
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    It's like "Tales were told of cabbages and kings". – TRomano Feb 6 at 20:15

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